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WooCommerce: The model of e-mail is displaying only the html, not css

I'm using the version 3.4.7 of WooCommerce and configuring the e-mails, I stare with a strange thing: the templates didn't appear the css. I experienced this in all of my sites, this is a test site that is installed WordPress and WooCommerce and nothing more.

Here is my config:

Image with my config

The current result is:

current result of my template

I expect something like this:

enter image description here

I don't know what I'm doing wrong. Thanks for help.